Ark shell

any marine bivalve of the family Arcidae, especially of the genus Arca, characterized by a heavy shell with a toothed hinge and a deep, boatlike inner surface.


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  • Arkwright

    a maker of chests, boxes, or coffers. Sir Richard, 1732–92, English inventor of the spinning jenny. Historical Examples arkwright invented the spinning machines, while a barber’s apprentice. The Mirror of Literature, Amusement, and Instruction, No. 365 Various arkwright combined the talents of an inventor with those of a man of business. The English Utilitarians, Volume […]

  • Arkwright furniture

    late medieval English furniture of simple construction.

  • Arkadelphia

    a city in central Arkansas. Historical Examples He was killed by a powder explosion on the gunboat Arkadelphia, twelve years ago. Two on the Trail Hulbert Footner When we landed at Arkadelphia we stayed all night and I was sold next day. Slave Narratives: A Folk History of Slavery in the United States Work Projects […]

  • Arkansas

    state in S central United States. 53,103 sq. mi. (137,537 sq. km). Capital: Little Rock. Abbreviation: AR (for use with zip code), Ark. a river flowing E and SE from central Colorado into the Mississippi in SE Arkansas. 1450 miles (2335 km) long. Contemporary Examples Sen. Blanche Lincoln, a Democrat from Arkansas is a perfect […]

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